@DROP

@drop <object> [=<message>]. <object can be a thing, player, exit, or 
room, specified as <name> or #<number> or 'me' or 'here'.  Sets the 
drop message for <object>.  Without a message argument, it clears the 
message.  On things and players, the message is displayed when it is 
dropped.  On exits, the message is displayed before a person enters the 
room the exit is pointed at, but after the Success message, if any.  
This string is not used in rooms.